How tall is this thing? I mean look at the surrounding objects (trucks, buildings, masts): it must be at least 15meters tall! It's amazing how they managed to stabilize it! Even the slightest gust of wind may proove disatrous!

Why? The engine produces enough thrust to counter any amount of wind, and it has both attitude thrusters and thrust vectoring to control its flight. Watch their other flight test videos on the Grasshopper (the predecessor of the F9R dev vehicle), it was able to fly in and hold against the wind with no problem.

What aspects most amuse you? The fanciful drydocks? The mission overkill with three bases? The obviously-not-Skylon-launched descent capsules?

For some reason I don't expect Skylon to actually come to fruition, but I would love if it did! The tech and aesthetics are awesome - and the pre-cooler tech shows promise. It's the funding issue I can't see being overcome.

I know I grimly joked about Zuckerberg buying SpaceX in the wake of the Oculus buyout, but if there's one space project that I'd like to see given an injection of dem Facebook moneys, it's Skylon.

The absurdity I suppose, and to a smaller extent the mediocrity. The music was absolutely horrible, the animation was relatively bad, and some of the mission design elements were absurd. Why have the huge transfer ships dock in Mars orbit? Why not just have the lander capsule undock from its original ship and dock with the crew ship? It's much easier that way. And the most hilariously absurd part was having the crew return capsules aerocapture back at Earth, only to have them get picked up by Skylons. It would be a really complicated move to do that, since you'd have to launch, rendezvous, and dock all in a single orbit, since the perigee of the capsules would be within the atmosphere, and it's just plain unnecessary. They can just return to Earth in those capsules. Why all the astronomical gymnastics and the extra Skylon flights? Even if the cost of a Skylon flight can be reduced to $5 million per launch, that's still a totally unnecessary expenditure of $30 million. I think that part of the mission got to me the most.

The wind tunnel hardware in the background is a near exact match for older wind tunnel test photos from SpaceX (none of which I can find at the moment).

Note the configuration of the Launch-escape/Landing Super-Draco pods - they're not evenly distributed in two-axis symmetry. They're now in two groups of two, with left-right symmetry.

There has been some speculation on Reddit that the newly-redesigned casings around the Super-Draco rockets resembles the F9r first-stage landing legs, and so might be the Dragon's legs. Early concept renderings have the legs poking through the heat-shield, which is probably a bad idea. How the rocket-pod-stowed legs (if they exist) might deploy is anyone's guess. One perhaps irrelevant detail gleaned from the DragonFly document is that they are made of steel, and that there "may be up to four"... which is an odd statement.

There's already a propulsion system on Soyuz landing capsule, so if you just amplify them by factor of 50, it will be a good landing system.

Not really, the Soyuz landing propulsion is a solid rocket, which is not useful for controlled propulsive landings. So you need a fundamentally different type of propulsion system, one which is easily controllable and deeply throttleable, and which preferably uses the same onboard propellants as existing thrusters. So the obvious answer is hypergolic-fueled engines, which is what they're using. They've actually been testing that exact engine, the SuperDraco, for a few years now. They have been talking about propulsive landings for Dragon for a long time.

There was the time when Korolyov suggested using rocket engines for landing and a new perspective space ship, which should have used only rocked engines. It is about that time he said: "How long we're going to fly on the rags?", meaning that parachutes should be replaced with something more controllable. Unfortunately, after his death, not much was done in regards to Zarya project.